Calling mechanism for automatic telephone systems.



No. 738,159. PATENTED SEPT. 8, 1903. J. J. BROWNRIGG & J. K. NORSTROM.CALLING MEGHANISM FOR AUTOMATIC TELEPHONE SYSTEMS.

APPLICATION FILED JUNE 3 1901.

4 SHEETS-SHE'ET 1.

NO MODEL.

mwxxkmg ASAJA No. 738,159. PATBNTED SEPT. 8, 1903. J. J. BROWNRIGG & J.K. NORSTROM.

CALLING MBGHANISM FOR AUTOMATIC TELEPHONE SYSTEMS.

APPLICATION FILED JUNE 3 1901- 4 SHEETS-SHEET 2.

NO MODI-1L.

PATENTED SEPT. 8, 1903. J. J. BROWNRIGG & J. K. NORSTROM.

CALLING MBCHANISM FR AUTOMATIC TELEPHONE SYSTEMS APPLICATION FILED JUNE3. 1901.

No MODEL.

PATENTED SEPT. 8, 1903. BROWNRIGG & J. K. NORSTROM.

CALLING MEGHANISM FOR AUTOMATIC TELEPHONE SYSTEMS.

NO MODEL.

d I fd APPLICATION FILED JUNE 31.1901.

4 SHEETS-SHEET 4.

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IINTTED STATES .Fatented September 8, 19S.

PATENT OEEICE.

JOIIN J. BROIVNRIGG AND JOHN K. NORSTROM, OF CHICAGO, ILLINOIS,ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO THE GLOBE AUTOMATICTELEPHONE COMPANY, OF CHICAGO, ILLINOIS, A CORPO- RATION OF ILLINOIS.

CALLING IVIECHANISM FOR AUTOMATIC TELEPHONE SYSTEMS.

SPECIFICATEON forming part of Letters Patent NO. 738,159,datedyseptember 8, 1903.

Application filed June 3, 1901. Serial No. 62,877. (No model.)

T0 @ZZ 107mm, it' may con/001%:

Be it known that we, JOHN J. BROWNRIGG and JOHN K. NoEs'rRoM,citizens ofthe United States, residing at Chicago, in the county of Cook and Stateof Illinois, have invented a new and useful Calling Mechanism forAutomatic Telephone Systems, of which the following is a specification.

This invention relates to calling mechanism for automatic telephonesystems, and is designed as an improvement upon the construction shown,described, and claimed in our pending application, Serial No. 41,134,filed December 26, 1900.

The object of the invention is to simplify and improve the construction.and arrangement of parts to render the same more eflicient inoperation.

The invention consists, subsrantially,in the construction, combination,location, and arrangement of parts, all as will be more fullyhereinafter set forth, as shown in the accompanying drawings, andfinally pointed out in the appended claims.

Referring to the accompanying drawings and to the various views andreference-signs appearing thereon, Figure l is aview in front elevationof a calling apparatus embodying the principles of our invention removedfrom the iuclosing case or call-box. side elevation of the same. Fig. 3is a front view of the call-box, showing the handles or knobs projectingtherethrough. Fig. 4 is a broken view, in front elevation, of thecallbox, showing the front board or plate removed therefrom anddisclosing the arrangement of the switches controlled by thereceiverhook. Fig. 5 is a top plan View of the construction shown inFig. 4. Fig. 6 is a detached broken detail view of portions of thereceiver-hook switches. Fig. 7 is a broken detail View, in transversesection, on the line 7 7 of Fig. l looking in the direction of thearrows. Fig. 8 is a broken detail view, in rear elevation, of theconstruction shown in Fig. 7, parts being omitted and showing therelation of the contactsprings R R R2 R3 and their cooperatingcontactdisks. Fig. 9 is a broken detail View in section of acounterweight and cylinder employed for restoring the parts to initialposition after the same have been displaced in the operation of theapparatus. Fig. l0 is a diagrammatic View illustrating the electriccircuits of the callboX. Fig. ll is a similar View of the circuits ofthe automatic apparatus at the central station in connection with whichthe calling apparatus is used.

The same part is designated by the same reference-sign Wherever itoccurs throughout the several views..

`Referring to the accompanying drawings, reference-sign A designates acall-box, which may be of the usual or any well-known construction andarrangement and having longitudinal slots or openingsB in the frontplate thereof, as shown in Fig. 3. Associated with 'each slotB is aseries of suitable graduations or indicating-points, as shown. Arrangedt0 project through each slot B is a handle or knob C C C2, each carryinga pointer or iinger D D D2, cooperating with the series ofindicating-points associated with the particular slot in which saidknobs or handles operate. Arranged Within the box or casing areguiderods E E' E2, forming guides for the knobs C C C2, respectively. Aconvenient arrangement is shown wherein each knob C C C2 is providedwith a guide-flange G, arranged to operate over guide-rods E E E2,respectively. Mounted upon each rod E E E2 is a sleeve F F F2 to freelyslide thereon. To each sleeve F is connected a cord or other suitableliexible device H II H2, said cords operatingover suitable guides J JJ2and around pulleys K K K2, mounted upon a shaft L, suitably journaledin a bracket or framing M, arranged Within the box or casing A. Fromsaid pulleys K K K2 the cords or other flexible connections H lead downthrough pipes or tubes N N N2 and are connected to plungers L',operatingin said cylinders. The weight of the plungers L should besuiiicient to normally maintain the sleeves F in the extreme limit oftheir upward movement or at the upper ends of guiderods E E The sleevesF bear against the under sides of anges G of knobs or handles C C C2,and consequently the countorwcights or plungers L normally tend tomaintain said knobs or handles in extreme elevation or raised position.lVhen a knob or handle is displaced from its normal or initial position,such displacement is against the action of counterweight L', and whenthe handles or knobs are released the counterweights return the same. Inorder that the return movenient of said knobs or handles to initialposition may be uniform, the extreme lower ends of the cylinders N N N2may be provided with an opening L2, controlled by a ball-valve M' in awell-understood manner.

Connected to rotate with each sheave or pulley K K' K2 is a disk P P P2and also a ratchetdisk Q Q' Q2, and contact-springs R R' R2 are arrangedto make successive contact with the teeth of contact-disks P P P2 whensaid disks are rotatively actuated, thus making repeated interruptionsin the circuit of which said disks and springs form part. Eachcontactdisk P should have as many teeth or contactpoints to contact withspringR R R2 as there are numbers in the graduations or scalesassociated with each knob or handle C C C2. Thus when handle or knob C,for instance, is displaced to correspond with the number 5 of thegraduation or scale then its corresponding contact-disk P is rotated adistance sufcient to make five successive contacts with itscorresponding contact-spring R during the return movement of saidcontact-disk. Ot' course each contact-disk will make succcssive contactswith its contact-spring R R 2 while the handles or knobs C C C2 arebeing moved into the desired registering position with respect to thegraduation or scales;

but, as will be made more clear hereinafter,

such contacts are made before the circuits which include saidcontact-disks are otherwise completed, and consequently no action isproduced, except during the return of the contact-disks to initialposition.

Mounted in framing M is a shaft S, upon which are pivoted pawls T T T2,said pawls operating over the ratchet-teeth of ratchetdisks Q Q' Q2,respectively, and respectively serving to lock said ratchet-disks indisplaced position. Thus when a knob or handle C has been displaced,thereby rotatively displacing its associated contact-disk andratchet-disk, a pawl T T' T2, as the case may be, will engage in theteeth of the displaced ratchetdisk and hold said disk and its associatedcontact wheel or disk in such displaced relation. Connected to the pawlT, which cooperates with ratchet-disk Q, is a lever A3, to which isconnected a rod B3, said rod being arranged in position to be actuatedor engaged by hand or otherwise, but preferably by a spring C3, carriedby the receiver-hook C4, when said hook is raised-that is, when thereceiver is removed therefrom. The pawls T T T2 may be normally held inconstant engaging relation with respect to the ratchet-disks in anysuitable manner-as, for instance, by gravity. In the case ofthe first`the'nuinber 5 of the graduation.

pawl T the weight of arm A3 aids gravity in maintaining engagement ofits associated ratchet-disk Q. Thus whenever the weight of the receiveris imposed upon the receiverhook the pawl T is permitted to engage theteeth of ratchet-disk Q. YVhen the receiver is raised from its hook andsaid hook is permitted to rise or rock under the inliuence of itsretractile E3, the spring or engaging projection C3, carried by saidreceiver-hook, engages rod B3 and raises the same, thereby releasingpawl T from engaging relation with respect to the teeth ot' ratchet-diskQ, and hence permitting the overbalancing counterweight L' te return thedisplaced sheave K and contact-disk P to initial position, thereturn ofsaid contact-disk P effecting the successive contacts with itscooperating contactspring R, as above explained. Suitably connectedtothe second pawl T is an arm F3. (See Fig. l and dotted lines, Fig. 2.)This arm is similar in all respects with the arm G3, (shown in Fig. 7,)except that arm G3 of Fig. 7 is not connected to the pawl u pon shaftS,while the arm F3 is connected to the pawl T.

Carried by sheave K is a stop H3, arranged to engage arm F3 and raise orrock the same when sheave or pulley K is in its initial or retractedposition, thereby releasing pawl T from engaging relation with respectto its ratchet-disk Q'. Similarly, pawl T2 is connected to the arm J3,arranged to be engaged by a stop K3 on sheave or pulley K', when saidsheave or pulley is in its initial or retracted position, therebyreleasing pawl T2 from engaging relation with respect to itsratchet-disk Q2. The last sheave or pulley K2 of the series is providedwith a stop or projection L3, arranged to engage an arm G3 ICO insimilar manner, also pivotally sleeved or mounted upon shaft S, and towhich is connected an insulating projection or arm M3, ar-l ranged toclose a circuit between contactpoints N3 O3, as will be explained morefully hereinafter. The arm G3 is provided with a projection or extensionP3, which serves to prevent said arm G3 from dropping too far when saidarm is relieved of its supporting projection L3-that is, when sheave orpulley K2 is rotatively displaced from its initial n or normal position.Upon the end of the sleeved hub of the last sheave or pulley K2 of theseries is carried a contact-arm Q3, (see Figs. l and 7,) with whichcooperates a contact-spring R3 for a purpose which will presently appearmore fully.

The operation of the apparatus so far described is as follows: Supposeit is desired to call No. 567 in the exchange system. The subscriberfirst grasps the knob C and moves the same along its slot B in the frontplate of box A until the pointer D corresponds to The knob or handle C'is then similarly displaced until the pointer D' corresponds to thenumber 6 of the associated graduations, and in like manner handle orknob C2is displaced until its pointer D2 corresponds to number 7 of itsassociated graduations. These movements will. result in rotativelydisplacthe contact-disks P P P2 to such relative positions as will causesaid contact-disks to make, respectively, tive, six, and sevensuccessive contacts with their associated springs R R R2, when saidcontact-disks are returned to their initial position. The depressedmovements of handles or knobs C C C2 are against the action of theirconnected counterweiglits L, and the pawls T T T2 operate to lock thecontact-disks in their rotativelydisplaced positions. The operator thenremoves the receiver from its hook. The raising of the hook effects araising of rod B3 and a consequent release of the pawl T of the rst setof successive contact-making devices and permits the return of the firstknob or haudle C to its initial or retracted position. When the partsassociated with said first handle or knob reach their normal or retract-Ved position, the locking-pawl of the second mechanism is released,thereby permitting the return of the second contact-disk from itsrotatively-displaced position and its return effecting the release ofthe next succeeding rot-atively-displaced contact-wheel, and so on. Thereturn of each contact-wheel to initial position edects the successivemakes and breaks of circuits, thereby sending successive impulsescorresponding in number to the number of the makes and breaks of thecircuits, such impulses traversing the circuits which include themagnets J6 and Q6 and which control the automatic apparatus at thecentral station through which the desired circuit connections with theline-wire of another subscriber are effected. These magnets J6 Q6 whenenergized operate to control ratchet mechanisms for operating orcontrolling the movement of a circuit-completing contact (indicateddiagrammatically at the right hand of Fig. ll) into the desired positionfor making circuit connection with the line-wire of the particularsubscriber being called. The construction and arrangementv of thisratchet mechanism or of the contact forms no part of the presentinvention, and consequently is merely indicated diagrammatically herein,the same forming the subjectmatter of our copending application executedof even date herewith, filed June 3, 1901, and

' bearing Serial No. 62,876.

We will now describe the construction of circuit-switches controlled bythe receiverhook O4, particular reference being had to Figs.4, 5, andt5. Reference-signm designates a wire which leads from a main battery B5at the central station. This wire leads to aspringcontact-stripA4,suitablymountedupon an insulated block B4 withinthe box or casing. Arranged on opposite sides of said strip A4 arecontact-strips QT and Q4. A wire agis connected to contact-strip Q7, anda wire n is connected to contact-strip Q4. Pivotally connected to theframe 2), upon which the receiver-hook is pivoted, is an arm or bracket30, upon which is mounted and insulated a contactstrip R4. .The arm 30is provided with projections 3l 32, between which the receiver-hook O4operates, said projections being spaced a sufficient distance apart topermit considerable movement of said receiverhook before it engages theone or the other of said projections, as thercase may be. Thecontact-strip R4 is arranged to engage the contact-springA4 when arm 30is raised by the receiver-hook C4, said contact-strip R4 being inengagement with contact-strip Q4, the parts in Fig. 4 being shown in thenormal position thereof When the receiver-hook is in its raisedposition. Now when the receiver is placed upon the receiver-hook C4 saidhook is rocked downwardly throughy a distance permitted by the spacebetween projections 3l and 32 without effecting any displacement of arm30 from the/ position shown in Fig. 4-that is, with contact-strip R4still in bridging or contacting relation with respect to both spring A4and contact-strip Q4. As the receiver-hook C4 approaches its lowermostlimit it engages projection 32, thereby rocking arm 30 about its pivot'and withdrawing contact-strip R4 from bridging relation with respect tocontact-spring A4 and strip Q4. Carried by the receiver-hook C4is aspring 33, having the contacting portions 34 35. The contacting portion35 is arranged to slide along the strip QT and the contacting portion 34is arranged to slide along the edge or surface of contactstrip Q4, sothat during the downward movement of the receiver-hook and before saidreceiver-hook engages the projection 32 of arm 30 to detachcontact-stripR4 from contacting relation with respect to spring A4circuit is completed between contact-strips Q7 and Q4 through thecontacting portions 34 35 of spring 33. The same is true when thereceiver-hook is being raised and before said hook reaches the point inits upward movement where it engages projection 3l. The contact-stripsQ7 Q4 are provided with de'- pressions or cut-away portions 36 37 3S 39,adapted to receive the contacting portions 35 34, so as to break thebridging circuit between said strips Q4 Q7 through said contactingportions 34 35 when the receiver-hook is in its extreme limit ofmovement in either direction. The receiver-hook C4 is provided with anextension arranged t0 make contact with contact-strips c, Zr, and Z,according to whether said hook is in raised or lowered position. Forinstance, when the receiver is placed upon the hook said hook makescontact with contact-strip c and when the receiver is raised from thehook said hook maintains contact with strips Zt and Z. A wire e isconnected to contact-strip c, and wires c'f4 are respectively connectedto strips 7c Z.

XVe will now explain the electrical operation of the apparatus,particular reference being had to the diagrams in Figs. l0 and ll, Fig.lO illustrating in diagram the circuit IOO connections of theVcall-boxand Fig. ll representing in diagram the circuits of the apparatuscontrolled by the calling mechanism. Reference-sign D4 designates thetransmitter; F4, a local battery; G4, the call-bell or ringer; E4, thereceiver; H4, an induction-coil; M4 and N4, binding-posts for theline-wires; J4, the shaft of the magneto-generator, and K4 the armaturethereof. Suppose it is desired to make a call. The subscribermanipulates the knobs or handles C to the proper position with referenceto the points or indications correspondingto the number to be called. Hethen raises his receiver from the hook, thereby releasing the lockswhich hold the mechanisms displaced by the lnovement of the handles orknobs and permitting such mechanisms to return to initial position. Thereturn of the rotatively-displaced contactdisks effects successivecontacts with their coperating springs, thereby completing circuits. Thecontact-spring R controls or is arranged in the following circuit: frommain battery B5 at the central station through line-wire fm,contact-strip A4, contact R4, contact-strip Q4, wire it, tocontact-strip S4, or the mass which includes the shaft L, upon which thevarious contact-disks P P P2 are mounted. Theuce from contact-disk P tocontact-spring R successively, and as many successive contacts are madeas there are teeth in the portion on the contact-disk which has beenrotatively displaced relatively to such spring. From contact-spring Rthis -circuit continues through wire c', contact 7c, receiver-hook C4,wire b, wire a, terminal M4, and line-wire CZ. Now, referring to Fig.ll, we will continue to trace this circuit through the apparatus at thecentral station simply for the purpose of clearly showing and describingthe coperative relation of the apparatus, enabling the desired call tobe effected. The current arrives at the central station over linewired', thence proceeds through wire e', the coils of magnet J5, wire fbattery strip or conductor A5, back to battery B5. The return of thesecond contactdisk P to initial position effects the successive make andbreak of the following circuit: from battery B5 to contact-strip or massS4, the same as before, thence through contactdisk P', spring R', wireg', wire h', wire 7L, terminal N4, line-wire lo. Arriving at the centralstation over said line-wire Zo', said circuit proceeds as follows: fromcontact-strip Z', contact m', wire n', wire fr', contact a2, contact b2,wire o2, the windings of a magnet Q5, wire d2, battery-strip A5, tobattery B5. The return of the third contact-disk P2 to its initialposition makes successive contacts with contact-spring R2, saidcontact-spring being included in the same circuit as that rst abovedescribed in connection with spring R all the way through from one poleof main battery B5 back to the other pole. As this contactdisk P2approaches its initial or retracted position the arm Q3 makes contactwith con- In case the line-wire of the subscriber being called isalready busy the parts are automatically returned or restored to theirinitial position, as fully explained in said application, and as suchconstruction and arrangement form no part of the present invention wewill not describe the same herein. When the desired circuit connectionsare completed, as above explained, the magneto-generator shaft J4 isactuated to effect the signal, and the actuation of said shaft breaksthe circuit of the calling subscribers receiver and also theshunt-circuit of said generator, as already more fully explained in ourpending application, above referred to. After the desired circuitconnections have been completed and the message or communicationdelivered the sub-Y scriber again places his receiver upon hook C4.During the first part of the travel or rocking movement of saidreceiver-hookthat is, until such hook traverses the space ordistancebetween projections 3l 32 of arm SO-the battery-circuit remains as abovedescribed-that is, from battery B5, wire m, contact-strip A4, contactR4, contact-strip Q4, wire n, and on as before-and which circuit remainsclosed between contact-strips A4 and Q4. While the receiver-hook was inits extreme raised position the contact projections 34 35 occupied aposition over the cnt-away parts or depressions 36 37 of strips Q7 Q4;but immediately said hook begins its downward movement said contactprojections engage or bear on the strips Q7 Q4, thereby bridging saidstrips and completing two circuits simultaneously, one of said circuitsbeing as follows: from battery B5, wire fm, to contactstrip A4, contactR4, contact Q4, spring 34, hook C4, wire b, wire ct, terminal M4,linewire d', and the other from battery to spring 34, as before, thenceto spring 85, contactstrip Q5, wire d2, wire g, wire 7i, terminal N4,and line-Wire k'. These circuits are completed through the apparatus atthe central station as follows: through line-wire d', wire e', magnetJ5, wire f', battery-strip A5, to battery B5, thereby effecting anactuation of magnetarmature lever LG and a closing of the circuitbetween contact-strips Z and m, and hence completing the other circuitabove referred to, which includes the contact-strip Q7 at thesending-station through wire 7s', contact Z', contact m9, wire H5,release-magnet J5, to battery-strip A5, to batteryB5, there- IOO IIO

by effecting a release of the apparatus at the central station and thereturn thereof toinitial position. Thereceiver-hook, continuing on itsdownward movement, finally engages projection and effects a rocking ofarm 30 and the consequent withdrawal of bridgingcontact Itl frombridging relation with respect to contacts Al and Q4, and when thisposition is reached the contact springs or projections Set arrive at thecut-out portions 38 39 in strips QT Q4, and consequently break thecircuits last-above traced between said strips and the receiver-hook.

From the foregoing description it will be seen that we provide anexceedingly simple and efficient apparatus for the purposes in view,with few working parts to get out oforder, and it will also be seen thatthe apparatus is placed in position for making a call bcfore anybattery-current is placed on the linewires. It will also be seen thatprovision is made for restoring the battery connections on theline-wires, so as to effect the automatic return ot' the apparatus toinitial or retracted position at the central station when thecommunication of the parties has beencompleted, and that suchrestoration of the battery connections is effected. by the act ofhanging up the receiver.

Having now set forth the object and nature of our invention and aconstruction and arrangement of apparatus embodying the principlesthereof, what we claim as new and useful and of our own invention, anddesire to secure by Letters Patent of the United States, is

l. In a calling apparatus for automatic telephone systems, a diskcarrying contacts, a cooperating stationary contact, a circuit includingsaid contacts, devices arranged in said circuit for effectingconnections with the linewire of any desired subscriber to be called, acounterweight connected to said disk and operating to hold the same inan initial or retracted position, means for rotatively displacing saiddisk against the action of said counterweight, means for locking saiddisk in displaced position, and automatic devices for releasing saidlock, as and for the purpose set forth.

2. In a calling apparatus for automatic telephone systems, a diskcarrying contacts, a cooperating stationary contact, a circuit includingsaid contacts, devices arranged in said circuit for effecting connectionwith the linewire of the desired subscriber to be called, acounterweight connected to said disk and operating to normally retainthe same in an initial or retracted position, a manually-actuated handlealso connected to said disk for rotatively displacing the same,meansforlocking said disk in displaced relation, and means for automaticallyreleasing said lock, as and for the purpose set forth.

3. Ina calling apparatus for automatic telephone systems, a diskcarrying contacts, a cooperating stationary contact, a circuit includingsaid contacts, devices arranged in said circuit for effecting thedesired connection with the line-Wire of the subscriber to be called, acounterweight connected to said disk and operating to normally retainsaid disk in an initial or retracted position, a manuallyactuatedhandpiece also connected to said disk for rotatively displacing thesame, a lock for holding said disk in displaced relation, areceiver-hook, and means actuated by the raising of the receiver fromsaid hook for releasing said lock, as and for the purpose set forth.

it. In a callingapparatus for automatic telephone systems, a diskcarrying contacts, a cooperating stationary contact, a circuit includingsaid contacts, devices arranged in said circuit and actuated by thesuccessive makes and breaks therein for effecting circuit connectionwith the line-wire of the desired subscriber to be called, acounterweight, connections between said counterweight and disk wherebysaid disk is held in an initial or retracted position, a handle, aguide-rod therefor, a sleeve mounted to travel on said guiderod andengaging underneath said handle, and connections between said sleeve anddisk whereby when said handle is displaced said disk is rotatively movedagainst the action of said counterweight, as and for the purpose setforth.

5. In a calling apparatus for automatic telephone systems, a diskcarrying contacts, a cooperating stationary contact, a counterweightconnected to said disk in an initial or retracted position, a handle, aguide-rod therefor, a

IOO

sleeve mounted upon said guide-rod and arranged to engage underneathsaid handle, connections between said sleeve and disk whereby byactuating said handle said Ydisk may be rotatively displaced, a lock forholding said disk in displaced relation, and means for releasing saidlock, as and for the purpose set forth.

G. In a calling apparatus for automatic telephone systems, a supportingshaft or stud, a series of disks independently sleeved upon said shaftand each carrying contacts, a coperat-ing stationary contact for eachcontactdisk, circuits controlled by each stationary contact and itscooperating contact disk, means for independently displacing saidcontact-disks rotatively upon said shaft, locks for holding said disksin their displaced positions, and means for releasing said locks, as andfor the purpose set forth.

7. In acalling apparatus forautomatic telephone systems, a disk carryingcontacts, a cooperating stationary contact, a ratchet-Wheel connected tosaid disk, a counterweight connected to said disk and operating tonormally maintain the same in an initial or retracted position, meansfor rotatively displacing said disk and wheel against the action of saidcounterweight, a pawl cooperating with said ratchet-wheel to hold saiddisk in rotativelydisplaced position, and means for automatic- IIO orretracted position, means for rotatively displacing said disk and wheelagainst the action of said counterweight, a pawl coperating with saidratchet-wheel to lock said disk and wheel in rotatively-displacedposition, an arm connected to said pawl, a receiver hook, said receiverhook arranged when raised to its upper position tofengage said arm andrelease said. pawl, as and for the purpose set forth.

9. In a calling apparatus forautomatic telephone systems, a series ofdisks each carrying contacts, a stationary contact coperating witheac-l1 of said contact-disks, a counterweight connected to each of saiddisks and operating to normally maintain the same in an initial orretracted position, means for independently displacing said disksrotatively, locking devices' for holding said disks in displacedrelation, and means for automatically releasing said locking mechanism,as and for the purpose set forth.

l0. In a calling apparatus for automatic telephone systems, a series ofdisks carrying contacts, a cooperating stationary contact for eachcontact-disk, a counterweight connected to each of said disks andoperating to normally maintain the same in an initial or retractedposition, means forindependently displacing each of said disksrotatively, locks for maintaining said disks in rotative displacement,means for automatically releasing the lock of the first contact-disk ofthe series to permit said disk to return to initial position, and meansactuated by the return of said disk into initial position for releasingthe lock of the neXt adjacent disk of the series, as and for the purposeset forth.

Il. In a calling apparatus for automatic telephone systems, a supportingstud or shaft, a series of contact disks independently sleeved upon saidshaft, a stationary contact cooperating with each of said contact-disks,a ratchet-Wheel connected to each of said disks, a counterweightconnected to each of said disks and operating to maintain the same in aninitial or retracted position, means for independently displacing saiddisks rotatively, pawls arranged to engage said ratchet- Wheels to holdthe same in displaced position, means for automatically releasing thelock of the first of said disks, and means actuated by the return of oneof said disks to initial position for releasing the lock of the nextsucceeding disk of the series, as and for the purpose set forth.

12. In a calling apparatus for automatic telephone systems, a supporting stud or shaft, a pulley mounted thereon, a contact-diskconnected to said pulley, a cooperating stationary contact, acounterweight, a cord or rope connected to maintain said pulley in aninitial or retracted position, a manually-actuated handle, a cord orrope also operating over said pulley and connected to said handle,whereby when said handle is displaced said pulley and contact-disk arerotatively moved upon said stud or shaft and against the action of saidcounterweight, means for locking said disk and pulleyin displacedposition, and means for automatically releasing said lock to permit saiddisk to return to initial position, as and for the purpose set forth.

13. In a calling apparatus for automatic telephone systems, a stud orshaft, a series of contact-disks mounted thereon, a stationarycooperating contact for each of said contactdisks, a ratchet-wheelconnected to each of said disks, a pawl coperating with each of saidcontact-wheels, a counterweight connected to each of said disks andoperating to maintain the same in an initial or retracted position,means for rotatively displacing said disks against the action of saidcounterweights, a stud or projection mounted to move with each disk andarranged when said disk is returned to initial position to engage thelocking-pawl of the next succeeding disk to release the same, and meansfor automatically releasing the locking-pawl of the first disk of theseries, as and for the purpose set forth.

14. In a calling apparatus for automatic telephone systems, thecombination with electrical devices for selecting any subscribers wire,circuits for said devices and including a battery, of a receiver-hook,insulated contacts arranged adjacent thereto and included in saidcircuits, a supplemental pivoted arm having lugs or extensions betweenwhich the receiver-hook operates, an insulated bridging contact or Wipercarried by said arm and operated by the engagement of the switch-hookwith said pivoted arm in its rising movement to bridge the circuitbetween said contacts to close said circuits through said contacts, asand for the purpose set forth.

l5. In a calling apparatus for automatic telephone systems, thecombination with electrical devices for selecting any subscribers wire,circuits for said devices including insulated contacts, a receiver-hookarranged adjacent thereto, a bracket pivotally mounted adjacent to saidreceiver-hook, a bridging contact-piece carried by said bracket andadapted to complete the circuit between said insulated contacts, saidreceiver hook arranged to engage said bracket as it approaches thelimits of its up and down movement to rock said bracket, whereby saidbridging contact is carried into or out of bridging relation withrespect to said insulated contacts, as and for the purpose set forth.

16. In a calling apparatus for automatic telephone systems, and incombination with electrical devices for selecting any subscrib- IOO IIO

ers line-wire,circuits therefor, including contacts insulated from eachother, a receiverhook arranged adjacent to said contact-s, apivotally-mounted bracket provided with projections between which saidhook operates, whereby as said hook approaches its limits of up and downmovements said bracket is engaged and rocked, and an insulated bridgingcontact-piece carried by said bracket and cooperating with said contactsto make or break circuit therebetween, as and for the purpose set forth.

17. In a calling apparatus for automatic telephone systems, and incombination with electrical devices for selecting any subscribers line,and a release device therefor, circuits for said devices includinginsulated contacts, an insulated wiper for bridging said contacts, apivotally-mounted bracket upon which said wiper is mounted and havingsuitably-spaced lugs or projections, a receiverhook arranged to operatebetween said lugs or projections to engage the same as it approaches itsup and down limits of movcm ent, and a bridging contact carried by saidreceiver-hook for controlling the circuit of said release device duringthe up and down movements thereof, as and for the purpose set forth.

18. In a calling apparatus for automatic telephone systems, and incombination with electrical devices for selecting any subscribers line,a release device for said selecting devices, a circuit for said releasedevice including insulated contacts, a receiver-hook carrying acontact-wiper also arranged in the circuit of said release device, saidcontactwiper cooperating with said insulated contacts to control thecircuit of said release device during the up and down movements of saidhook, and means for breaking circuit between said contacts and wi per asthe receiverhook approaches its extreme up and down limits of movement,as and for the purpose set forth.

19. In a calling apparatus for automatic telephone systems, and. incombination with means for selecting the line of any subscriber, arelease device, a circuit therefor including insulated contact-strips, areceiver-hook, a contact-wiper carried thereby and operating over saidcontact-strips to bridge the circuit therebetween, said contact-stripsprovided with depressions or seats at points adjacent to the upper andlower limits of movement of said hook, whereby said contact-strips .arebridged during a portion only of the up and down travel or movement ofsaid hook, as and for the purpose set forth.

20. In a calling apparatus for automatic telephone systems, and incombination with devices for selecting the line-wire of any subscriber,a release device for said selecting mechanism, a circuit thereforincluding an insulated contact, electrical devices for controlling thecircuit of said release device, a circuit for said electrical devicesincluding an insulated contact, a receiver-hook, a doubleended wipercarried thereby and operating to complete said circuits from saidinsulated contacts during a portion of 'the up and down movements ofsaid receiver-hook, as and for the purpose set forth.

In witness whereof We have hereunto set our hands, this 24th day of May,1901, in the presence of the subscribing Witnesses.

JOI-IN J. BROVNRIGG. JOHN K. NORSTROM. Witnesses:

E. C. SEMFLE, S. E. DARBY.

